:root {
  --color-canvas: #f5f3ee;
  --color-surface: #fffdf9;
  --color-surface-muted: #f9f7f2;
  --color-ink: #20262d;
  --color-ink-soft: #5c6570;
  --color-navy: #243c52;
  --color-navy-deep: #182d40;
  --color-rust: #955343;
  --color-gold: #b28a50;
  --color-line: #dedbd2;
  --color-line-strong: #cac5b9;
  --shadow-soft: 0 18px 45px rgba(31, 42, 51, 0.07);
  --shadow-card: 0 8px 22px rgba(31, 42, 51, 0.045);
  --radius-sm: 0.45rem;
  --radius-md: 0.8rem;
  --radius-lg: 1.25rem;
  --space-1: 0.35rem;
  --space-2: 0.65rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.25rem;
  --space-6: 3.5rem;
  --content-width: 66rem;
  --reading-width: 48rem;
  --transition: 200ms ease;
  --font-serif: "Iowan Old Style", "Songti SC", "STSong", "Noto Serif CJK SC", "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif CJK JP", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, "Times New Roman", serif;
  --font-sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Hiragino Sans", "Yu Gothic", sans-serif;
}

html:lang(zh) {
  --font-serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif CJK SC", Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
}

html:lang(ja) {
  --font-serif: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif CJK JP", "Source Han Serif JP", serif;
  --font-sans: "Hiragino Sans", "Yu Gothic", "Noto Sans CJK JP", "Source Han Sans JP", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-ink);
  background: var(--color-canvas);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: var(--color-navy);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 0.08em;
  transition: color var(--transition), background-color var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

a:hover {
  color: var(--color-rust);
}

a:focus-visible {
  outline: 3px solid rgba(178, 138, 80, 0.5);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

h1,
h2,
h3 {
  color: var(--color-navy-deep);
  font-weight: 600;
  line-height: 1.2;
  text-wrap: balance;
}

p,
ul {
  margin-top: 0;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.55rem 0.8rem;
  color: #fff;
  background: var(--color-navy-deep);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0.75rem;
  z-index: 20;
  width: min(calc(100% - 2rem), var(--content-width));
  margin: 0.75rem auto 0;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 3.7rem;
  padding: 0.55rem 0.75rem 0.55rem 1.15rem;
  border: 1px solid rgba(202, 197, 185, 0.86);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 249, 0.9);
  box-shadow: 0 9px 30px rgba(31, 42, 51, 0.055);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-name,
.nav-links a,
.button,
.site-footer,
.eyebrow,
.last-updated {
  font-family: var(--font-sans);
}

.site-name {
  flex: 0 0 auto;
  color: var(--color-navy-deep);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.15rem;
}

.nav-cluster {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.55rem;
  min-width: 0;
}

.nav-links a {
  padding: 0.48rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.025em;
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--color-navy-deep);
  background: var(--color-surface-muted);
}

.nav-links a.active {
  color: #fff;
  background: var(--color-navy);
}

.language-switcher {
  display: flex;
  align-items: center;
  gap: 0.12rem;
  padding-left: 0.55rem;
  border-left: 1px solid var(--color-line);
  font-family: var(--font-sans);
}

.language-switcher a {
  padding: 0.3rem 0.38rem;
  border-radius: 0.32rem;
  color: var(--color-ink-soft);
  font-size: 0.66rem;
  font-weight: 650;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.language-switcher a:hover {
  color: var(--color-navy-deep);
  background: var(--color-surface-muted);
}

.language-switcher a.active {
  color: var(--color-rust);
  background: rgba(149, 83, 67, 0.08);
}

.site-shell {
  width: min(calc(100% - 2rem), var(--content-width));
  margin: 0 auto;
}

.page-content {
  min-height: calc(100vh - 13rem);
  padding: var(--space-6) 0;
}

.page-heading {
  position: relative;
  max-width: var(--reading-width);
  margin: 0 auto var(--space-5);
  padding-bottom: var(--space-4);
  text-align: center;
}

.publications,
.preprints,
.math-resume {
  width: min(100%, var(--reading-width));
  margin: 0 auto;
}

.resume-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(13rem, 22vw, 16rem);
  align-items: start;
  gap: 2rem;
}

.resume-page .page-heading {
  margin-left: 0;
  margin-right: auto;
}

.resume-layout .math-resume {
  width: 100%;
}

.publication {
  position: relative;
  margin-bottom: 0.9rem;
  padding: 1.15rem 1.3rem 1.15rem 1.45rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 249, 0.82);
  box-shadow: var(--shadow-card);
}

.publication::before {
  position: absolute;
  top: 1.1rem;
  bottom: 1.1rem;
  left: 0;
  width: 2px;
  border-radius: 0 2px 2px 0;
  background: rgba(36, 60, 82, 0.62);
  content: "";
}

.publication:last-child {
  margin-bottom: 0;
}

.publication p {
  margin: 0;
  line-height: 1.62;
}

.publication strong {
  color: var(--color-navy-deep);
}

.publication em {
  color: #383f47;
}

.publication a,
.math-resume .btn {
  display: inline-block;
  margin-left: 0.28rem;
  padding: 0.12rem 0.42rem;
  border: 1px solid var(--color-line-strong);
  border-radius: 0.32rem;
  color: var(--color-navy);
  background: rgba(249, 247, 242, 0.75);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
  text-decoration: none;
  vertical-align: 0.08em;
}

.publication a:hover,
.math-resume .btn:hover {
  color: var(--color-rust);
  border-color: rgba(149, 83, 67, 0.55);
  background: #fffaf4;
}

.publication .doi {
  color: var(--color-ink-soft);
  font-family: var(--font-sans);
  font-size: 0.72rem;
}

.ai-publications .publication::before {
  background: rgba(149, 83, 67, 0.75);
}

.ai-publications .publication {
  border-color: rgba(149, 83, 67, 0.22);
  background: rgba(255, 251, 246, 0.88);
}

.ai-verification-note {
  margin-bottom: var(--space-4);
  padding: 1rem 1.15rem;
  border: 1px solid rgba(149, 83, 67, 0.25);
  border-left: 3px solid var(--color-rust);
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  background: rgba(255, 250, 244, 0.82);
  font-size: 0.94rem;
  line-height: 1.65;
}

.language-note {
  color: var(--color-rust);
  font-family: var(--font-sans);
  font-size: 0.76em;
  font-weight: 650;
  white-space: nowrap;
}

.note-links {
  display: inline;
}

.math-resume > * {
  margin-bottom: var(--space-4);
}

.math-resume > *:last-child {
  margin-bottom: 0;
}

.resume-header {
  padding: 2rem clamp(1.25rem, 5vw, 2.5rem);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  text-align: center;
}

.resume-header .resume-name {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.65rem, 4vw, 2.15rem);
}

.contact-info {
  color: var(--color-ink-soft);
  font-size: 0.92rem;
}

.contact-info p {
  margin-bottom: 0.45rem;
}

.contact-info a {
  color: var(--color-navy);
  text-decoration-color: rgba(36, 60, 82, 0.32);
}

.attachments {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
  margin-top: var(--space-3);
}

.math-resume .attachments .btn {
  min-width: 8.5rem;
  margin: 0;
  padding: 0.55rem 1rem;
  color: #fff;
  border-color: var(--color-navy);
  background: var(--color-navy);
}

.math-resume .attachments .btn:hover {
  color: #fff;
  border-color: var(--color-navy-deep);
  background: var(--color-navy-deep);
}

.math-resume section {
  padding: 1.45rem clamp(1.15rem, 4vw, 2rem);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 249, 0.72);
}

.math-resume section h2 {
  margin: 0 0 var(--space-3);
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--color-line);
  font-size: 1.35rem;
}

.math-resume section h3 {
  margin: 0 0 0.35rem;
  font-size: 1.08rem;
}

.math-resume section p {
  margin-bottom: 0.55rem;
}

.math-resume section ul {
  margin-bottom: 0;
  padding-left: 1.35rem;
}

.research-focus {
  border-color: rgba(149, 83, 67, 0.22) !important;
  background: rgba(255, 250, 244, 0.78) !important;
}

.timeline-item {
  position: relative;
  margin-bottom: 1.45rem;
  padding-left: 1.35rem;
  border-left: 1px solid var(--color-line-strong);
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-item::before {
  position: absolute;
  top: 0.42rem;
  left: -0.29rem;
  width: 0.52rem;
  height: 0.52rem;
  border: 2px solid var(--color-surface);
  border-radius: 50%;
  background: var(--color-rust);
  box-shadow: 0 0 0 1px rgba(149, 83, 67, 0.42);
  content: "";
}

.experience-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding-left: 0;
  border-left: 0;
}

.experience-item::before {
  display: none;
}

.experience-item + .experience-item {
  padding-top: 1.25rem;
  border-top: 1px dashed var(--color-line);
}

.experience-copy {
  min-width: 0;
}

.institution-logo {
  position: relative;
  display: grid;
  flex: 0 0 3.2rem;
  width: 3.2rem;
  height: 3.2rem;
  overflow: hidden;
  place-items: center;
  border: 1px solid var(--color-line);
  border-radius: 0.7rem;
  background: #fff;
  box-shadow: 0 4px 12px rgba(31, 42, 51, 0.045);
}

.institution-logo img {
  width: 2.4rem;
  height: 2.4rem;
  object-fit: contain;
}

.institution-logo-amss img {
  width: 2.2rem;
  height: 2.2rem;
}

.institution-logo-omu img {
  width: 2.5rem;
  height: 2.2rem;
}

.institution-logo-ustc img {
  width: 2.5rem;
  height: 2.5rem;
}

.resume-aside {
  position: sticky;
  top: 6rem;
}

.resume-feature-image {
  position: relative;
  width: 100%;
  margin: 0;
  padding: 0.38rem;
  border: 1px solid var(--color-line);
  border-radius: 1rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.resume-feature-image::before {
  position: absolute;
  inset: 0.8rem -0.5rem -0.5rem 0.8rem;
  z-index: -1;
  border: 1px solid rgba(178, 138, 80, 0.5);
  border-radius: 1rem;
  content: "";
}

.resume-feature-image img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  border-radius: 0.72rem;
  object-fit: cover;
  object-position: 67% center;
}

.institution {
  color: var(--color-navy);
  font-weight: 600;
}

.institution a {
  color: inherit;
  text-decoration-color: rgba(36, 60, 82, 0.32);
}

.institution a:hover {
  color: var(--color-rust);
}

.math-container {
  margin: var(--space-4) 0;
  padding: var(--space-3);
  border-left: 2px solid var(--color-gold);
  border-radius: var(--radius-sm);
  background: #fffaf1;
}

mjx-container[display="true"] {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.25rem 0;
}

.page-heading::after {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 3.25rem;
  height: 2px;
  background: var(--color-gold);
  content: "";
  transform: translateX(-50%);
}

.page-heading h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.025em;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 12.5rem;
  align-items: center;
  gap: clamp(2.5rem, 7vw, 5.5rem);
  min-height: 30rem;
  padding: clamp(2rem, 7vw, 5.25rem) clamp(1.25rem, 5vw, 4.5rem);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.hero-copy {
  max-width: 39rem;
}

.eyebrow {
  margin-bottom: var(--space-3);
  color: var(--color-rust);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 var(--space-3);
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  letter-spacing: -0.045em;
}

.hero h1 span {
  display: inline-block;
  color: var(--color-ink-soft);
  font-size: 0.58em;
  font-weight: 500;
  letter-spacing: 0;
  white-space: nowrap;
}

.hero-role {
  margin-bottom: var(--space-4);
  color: var(--color-navy);
  font-size: clamp(1.08rem, 2.5vw, 1.28rem);
  font-weight: 600;
  line-height: 1.45;
}

.hero-introduction {
  color: var(--color-ink-soft);
}

.hero-introduction p {
  margin-bottom: var(--space-3);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--space-4);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 8.2rem;
  min-height: 2.75rem;
  padding: 0.62rem 1.1rem;
  border: 1px solid var(--color-navy);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.025em;
  text-decoration: none;
}

.button-primary {
  color: #fff;
  background: var(--color-navy);
}

.button-primary:hover {
  color: #fff;
  background: var(--color-navy-deep);
  transform: translateY(-1px);
}

.button-secondary {
  color: var(--color-navy);
  background: transparent;
}

.button-secondary:hover {
  color: var(--color-navy-deep);
  background: var(--color-surface-muted);
  border-color: var(--color-navy-deep);
}

.portrait-frame {
  position: relative;
  margin: 0;
}

.portrait-frame::before {
  position: absolute;
  inset: -0.65rem 0.65rem 0.65rem -0.65rem;
  z-index: 0;
  border: 1px solid rgba(178, 138, 80, 0.55);
  border-radius: 1.15rem;
  content: "";
}

.portrait-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  border: 5px solid var(--color-surface);
  border-radius: 1rem;
  box-shadow: var(--shadow-card);
  object-fit: cover;
}

.last-updated {
  margin-top: var(--space-4);
  color: var(--color-ink-soft);
  font-size: 0.76rem;
  letter-spacing: 0.035em;
  text-align: center;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) 0 var(--space-5);
  border-top: 1px solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: 0.78rem;
  letter-spacing: 0.025em;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-rust);
}

@media (max-width: 1060px) {
  .resume-layout {
    grid-template-columns: 1fr;
  }

  .resume-page .page-heading {
    margin-right: auto;
    margin-left: auto;
  }

  .resume-aside {
    position: static;
    width: min(100%, 32rem);
    margin: 0 auto;
  }

  .resume-feature-image img {
    aspect-ratio: 16 / 9;
    object-position: center 58%;
  }
}

@media (max-width: 860px) {
  .site-header {
    position: static;
  }

  .navbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.4rem;
    padding: 0.75rem;
  }

  .nav-cluster {
    align-items: flex-start;
    flex-direction: column;
    width: 100%;
  }

  .site-name {
    padding: 0.15rem 0.55rem;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: flex-start;
    width: 100%;
  }

  .language-switcher {
    margin-left: 0.45rem;
    padding-left: 0;
    border-left: 0;
  }

}

@media (max-width: 720px) {
  body {
    font-size: 1rem;
  }

  .page-content {
    padding: var(--space-5) 0;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr) 8.5rem;
    gap: 1.75rem;
    min-height: 0;
    padding: 2.4rem 2rem;
  }

  .hero h1 span {
    display: block;
    margin-top: 0.3rem;
  }

  .publication {
    padding: 1rem 1rem 1rem 1.2rem;
  }

  .resume-header,
  .math-resume section {
    padding: 1.25rem;
  }

  .experience-item {
    gap: 0.8rem;
  }

  .institution-logo {
    flex-basis: 3rem;
    width: 3rem;
    height: 3rem;
  }
}

@media (max-width: 520px) {
  .site-header,
  .site-shell {
    width: min(calc(100% - 1.15rem), var(--content-width));
  }

  .navbar {
    border-radius: 0.65rem;
  }

  .nav-links {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.15rem;
  }

  .language-switcher {
    margin-left: 0.15rem;
  }

  .nav-links a {
    padding: 0.48rem 0.2rem;
    font-size: 0.68rem;
    text-align: center;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 2.2rem;
    padding: 2rem 1.35rem 2.3rem;
  }

  .hero-copy {
    display: contents;
  }

  .eyebrow,
  .hero h1,
  .hero-role,
  .hero-introduction,
  .hero-actions {
    grid-column: 1;
  }

  .eyebrow {
    margin-bottom: -1.55rem;
  }

  .hero h1 {
    margin-bottom: -1.35rem;
  }

  .hero-role {
    margin-bottom: -1.2rem;
  }

  .portrait-frame {
    grid-row: 4;
    width: 8.75rem;
    margin: 0.2rem auto 0;
  }

  .hero-introduction {
    grid-row: 5;
  }

  .hero-actions {
    grid-row: 6;
  }

  .button {
    flex: 1 1 8rem;
  }

  .page-heading {
    margin-bottom: 1.75rem;
  }

  .publication {
    border-radius: 0.65rem;
  }

  .publication a {
    margin-top: 0.25rem;
  }

  .contact-info {
    overflow-wrap: anywhere;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}